YASKAWA SGD7S series Product Manual page 533

Problem Possible Cause
There is a mistake in the Ser-
vomotor wiring.
There is a mistake in the wir-
ing of the encoder or Serial
Converter Unit.
There is a mistake in the lin-
ear encoder wiring.
The setting of Pn282 (Linear
Servomotor
Encoder Scale Pitch) is not
Moves
correct.
Instanta-
neously,
The count-up direction of the
and Then
linear encoder does not
Stops
match the forward direction
of the Moving Coil in the
motor.
Polarity detection was not
performed correctly.
Servomotor
There is a faulty connection
Speed Is
in the Servomotor wiring.
Unstable
Speed control: The speed
reference input is not appro-
priate.
Torque control: The torque
reference input is not appro-
priate.
The speed reference offset is
not correct.
Servomotor
Moves with-
Position control: The refer-
ence pulse input is not
out a Refer-
appropriate.
ence Input
A failure occurred in the
SERVOPACK.
The count-up direction of the
linear encoder does not
match the forward direction
of the Moving Coil in the
motor.
Polarity detection was not
performed correctly.
12.4 Troubleshooting Based on the Operation and Conditions of the Servomotor
Confirmation
Check the wiring.
Check the wiring.
Check the wiring.
Check the setting of
Pn282.
Check the directions.
Check to see if electrical
angle 2 (electrical angle
from polarity origin) at any
position is between ±10°.
The connector connec-
tions for the power line
(U, V, and W phases) and
the encoder or Serial
Converter Unit may be
unstable. Check the wir-
ing.
Check between the
speed reference input (V-
REF) and signal ground
(SG) to see if the control
method and the input
agree.
Check between the
torque reference input (T-
REF) and signal ground
(SG) to see if the control
method and the input
agree.
The SERVOPACK offset
is adjusted incorrectly.
Check the setting of
Pn200 =n.X (Refer-
ence Pulse Form) and the
sign and pulse signals.
–
Check the directions.
Check to see if electrical
angle 2 (electrical angle
from polarity origin) at any
position is between ±10°.
Continued from previous page.
Correction Reference
Wire the Servomotor
–
correctly.
Wire the Serial Con-
–
verter Unit correctly.
Wire the cable cor-
–
rectly.
Correct the setting of
page 5-19
Pn282.
Change the setting of
Pn080 = n.X
(Motor Phase
Sequence Selection). page 5-24
Place the linear
encoder and motor in
the same direction.
Correct the settings for
the polarity detection-
–
related parameters.
Tighten any loose ter-
minals or connectors
–
and correct the wiring.
Correctly set the con-
trol method and input page 9-7
method.
Correctly set the con-
trol method and input
page 9-7
method.
Adjust the SERVO-
page 6-19
PACK offset.
Correctly set the con-
trol method and input
–
method.
Replace the SERVO-
–
PACK.
Change the setting of
Pn080 = n.X
(Motor Phase
Sequence Selection).
page 5-24
Match the linear
encoder direction and
Servomotor direction.
Correct the settings for
the polarity detection-
–
related parameters.
Continued on next page.
12
12-57